Turbofans combine the best of both worlds between turbojets and turboprops. And, you'll probably see these engines when you head out to the airport for your next airline flight. Turbofans work by attaching a ducted fan to the front of a turbojet engine. The fan creates additional thrust, helps cool the engine, and lowers the noise output of the engine.
Step 1 : Inlet air is divided into two separate streams. One stream flows around the engine bypass air , while the other passes through the engine core.
Step 2 : Bypass air passes around the engine and is accelerated by a duct fan, producing additional thrust. Step 3 : Air flows through the turbojet engine, continuing the production of thrust. Turbofan takeaway:. Bell helicopter with turboshaft engine. Turboshaft engines are primarily used on helicopters. The biggest difference between turboshafts and turbojets is that turboshaft engines use the majority of their power to turn a turbine, rather than produce thrust out the back of the engine.
Turboshafts are essentially a turbojet engine with a large shaft connect to the back of it. And since most of these engines are used on helicopters, that shaft is connected to the rotor blade transmission.
Step 1 : The engine operates like a turbojet, for the most part. Step 2 : The power shaft attached to the turbine powers the transmission. Step 3 : The transmission transfers rotation from the shaft to the rotor blade. Step 4 : The helicopter, through mostly unknown and magical means, is able to fly through the sky. Turboshaft takeaway:. Gas turbine engines have come a long way in the past years.
And while turbojets, turboprops, turbofans and turboshafts all have their differences, they way they produce power is essentially the same: intake, compression, power, and exhaust. Become a better pilot. Subscribe to get the latest videos, articles, and quizzes that make you a smarter, safer pilot.
Colin is a Boldmethod co-founder, pilot and graphic artist. Viewed 5k times. Improve this question. DeltaLima Victor Juliet Victor Juliet 6, 5 5 gold badges 39 39 silver badges 82 82 bronze badges. Add a comment. Active Oldest Votes. Image source Turbine blades are more curved, often in almost "U" shapes like the ones seen here.
In particularly large and recent engines, where efficiency is critical, turbine blades will often be full of tiny holes: Image source To distinguish between high pressure and low pressure stages compressor or turbine does not matter , the length of the blade and its torsion i.
On the other hand, radial compressors and radial turbines are more difficult to distinguish. Improve this answer. Community Bot 1. Voted up for the description. I'd like to know if there is a way to identify the stage from visual inspection too? A "fan" is an apparatus with rotating blades that creates a current of air. That's not what turbines do. A turbine converts fluid water, air, steam, etc.
They are opposites. For this reason, most ceiling fans incorporate blades that are comparatively inefficient drag devices; rotating the pitched blades pushes air vertically out of the way. Wide, flat blades are inexpensive to build and work well as drag devices. More blades are better, up to a point, and the usual layout of four or five blades is the result of balancing trade-offs between efficiency and expense. A article in Mechanical Engineering chronicled the quest of a man named Danny Parker to create a more efficient ceiling fan.
Note: This question was submitted by J. Lester, Stroudsburg, Pa. Already a subscriber? Sign in. Thanks for reading Scientific American. Create your free account or Sign in to continue.
0コメント